C- Peptide Test
The C-peptide test is done to determine the amount of insulin being produced in the body and whether the patient suffers from insulin resistance, type 1 or type-2 diabetes.
Why is the test ordered?
A C-peptide test is ordered to help differentiate between type 2 and type-1 diabetes, as well as to determine the cause of hypoglycaemia, i.e. low blood sugar. In addition, the test is also recommended to check whether a tumour in the pancreas (insulinoma) has been completely removed. The test may also be recommended to determine whether a person is insulin resistant.
When is the test recommended?
The test may be ordered to evaluate the residual beta cell function of an individual newly diagnosed with type 1 diabetes and also to monitor beta cells and insulin production in an individual with type 2 diabetes. The test may also be recommended to individuals with hypoglycaemia or when high levels of insulin are suspected.
Physicians also recommend this test at frequent intervals of time to patients diagnosed with insulinoma, in order to determine whether the ongoing treatment is having a healing effect on the patient's condition or not.
How is the sample collected?
A blood sample is collected from a vein in the arm.
How to prepare for the test?
The person taking the test may be advised to stop eating and drinking for up to 8 to 10 hours before the test.
